In 2022, Keystone, SD had a population of 385 people with a median age of 37.5 and a median household income of $58,646. Between 2021 and 2022 the population of Keystone, SD declined from 469 to 385, a −17.9% decrease and its median household income grew from $53,194 to $58,646, a 10.2% increase.
The 5 largest ethnic groups in Keystone, SD are White (Non-Hispanic) (69.4%), White (Hispanic) (17.7%), Two+ (Non-Hispanic) (9.87%), American Indian & Alaska Native (Non-Hispanic) (2.08%), and Asian (Non-Hispanic) (0.519%).
None of the households in Keystone, SD reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
100% of the residents in Keystone, SD are U.S. citizens.
In 2022, the median property value in Keystone, SD was $161,700, and the homeownership rate was 65.2%.
Most people in Keystone, SD drove alone to work, and the average commute time was 23.8 minutes. The average car ownership in Keystone, SD was 3 cars per household.